Revert of Activity Logger Refactoring. (https://codereview.chromium.org/370763002/)

Reason for revert:
Change is causing layout test failures related to XmlHttpRequest: http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.6/builds/29827

Original issue's description:
> Activity Logger Refactoring.
> 
> Enable Activity Logger to log issuing requests caused by extensions on pages.
> 
> BUG=388287
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177761

TBR=jochen@chromium.org,haraken@chromium.org,pfeldman@chromium.org,pmarch@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=388287

Review URL: https://codereview.chromium.org/381783002

git-svn-id: svn://svn.chromium.org/blink/trunk@177764 bbb929c8-8fbe-4397-9dbb-9b2b20218538